mitt romney says president obama is partially to blame. he accuses the president of contributing to rising gas prices by slowing the licensing and permitting of offshore and onshore drilling. the former massachusetts governor says he'll excel rate permits and the keystone pipeline which will bring oil from canada to the u.s. newt gingrich is counting on a good showing in next tuesday's primaries to keep his white house hopes alive. aides say he needs to win those contest just to stay in the race. gingrich canceled influence campaign in kansas this weekend so he can focus on the south. kansas holds its caucuses on saturday. newt gingrich's main competition in alabama and mississippi is rick santorum. he's telling voters in those states that he is the true conservative candidate who can best challenge president obama in november. >>> the feds are trying to figure out who keeps mailing letters with white powder in them. the three such letters showed up in d.c. yesterday. one letter found at the epa building at constitution avenue, another at